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Influence of Drought Stress on the Rhizosphere Bacterial Community Structure of Cassava (Manihot esculenta Crantz)

文献类型： 外文期刊

作者： Huang, Huling 1 ; Li, Mingchao 1 ; Guo, Qiying 1 ; Zhang, Rui 1 ; Zhang, Yindong 3 ; Luo, Kai 1 ; Chen, Yinhua 1 ;

作者机构： 1.Hainan Univ, Sanya Inst Breeding & Multiplicat, Sch Breeding & Multiplicat, Sanya 572025, Peoples R China

2.Hainan Univ, Sch Trop Agr & Forestry, Haikou 570228, Peoples R China

3.Hainan Acad Agr Sci, Inst Plant Protect, Key Lab Plant Dis & Pest Control Hainan Prov, Haikou 571100, Peoples R China

关键词： drought stress; cassava; rhizosphere bacterial community; environmental factor; drought response

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：4.9； 五年影响因子：5.6 ）

ISSN： 1661-6596

年卷期： 2024 年 25 卷 13 期

页码：

收录情况： SCI

摘要： Drought presents a significant abiotic stress that threatens crop productivity worldwide. Rhizosphere bacteria play pivotal roles in modulating plant growth and resilience to environmental stresses. Despite this, the extent to which rhizosphere bacteria are instrumental in plant responses to drought, and whether distinct cassava (Manihot esculenta Crantz) varieties harbor specific rhizosphere bacterial assemblages, remains unclear. In this study, we measured the growth and physiological characteristics, as well as the physical and chemical properties of the rhizosphere soil of drought-tolerant (SC124) and drought-sensitive (SC8) cassava varieties under conditions of both well-watered and drought stress. Employing 16S rDNA high-throughput sequencing, we analyzed the composition and dynamics of the rhizosphere bacterial community. Under drought stress, biomass, plant height, stem diameter, quantum efficiency of photosystem II (Fv/Fm), and soluble sugar of cassava decreased for both SC8 and SC124. The two varieties' rhizosphere bacterial communities' overall taxonomic structure was highly similar, but there were slight differences in relative abundance. SC124 mainly relied on Gamma-proteobacteria and Acidobacteriae in response to drought stress, and the abundance of this class was positively correlated with soil acid phosphatase. SC8 mainly relied on Actinobacteria in response to drought stress, and the abundance of this class was positively correlated with soil urease and soil saccharase. Overall, this study confirmed the key role of drought-induced rhizosphere bacteria in improving the adaptation of cassava to drought stress and clarified that this process is significantly related to variety.

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